package com.eureka.client.demo.utils;


import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;

import java.text.SimpleDateFormat;

@Slf4j
public class JsonUtil {

    public static ObjectMapper objectMapper= new ObjectMapper();

    static {

        //对象的所有字段全部列入
        objectMapper.setSerializationInclusion(JsonInclude.Include.ALWAYS);

        //取消默认转换timestamps形式
        objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS,false);

        //忽略空Bean转json的错误
        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS,false);

        //所有的日期格式都统一为一下的样式，即yyyy-MM-dd HH:mm:ss
        objectMapper.setDateFormat(new SimpleDateFormat(DateTimeUtil.FMT_DATETIME));

        //忽略 在json字符串中存在，但是在java对象中不存在对应属性的情况。防止错误
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);

    }

    public static <T> String obj2Str(T obj){
        if (obj == null){
            return null;
        }
        try {
            return obj instanceof String ? (String) obj : objectMapper.writeValueAsString(obj);
        } catch (Exception e) {
            log.warn(" parse object to string error",e);
            return null;
        }
    }

    public static <T> String obj2StrPretty(T obj){
        if (obj == null){
            return null;
        }
        try {
            return obj instanceof String ? (String) obj : objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
        } catch (Exception e) {
            log.warn(" parse object to string error",e);
            return null;
        }
    }

    public static <T> T str2Obj(String str,Class<T> clazz){
        if(StringUtils.isBlank(str) || clazz == null){
            return null;
        }
        try {
            return clazz.equals(String.class)? (T) str : objectMapper.readValue(str,clazz);
        } catch (Exception e) {
            log.warn("parse string to Object error",e);
            return null;
        }
    }

    public static <T> T str2Obj(String str, TypeReference<T> typeReference){
        if(StringUtils.isBlank(str) || typeReference == null){
            return null;
        }
        try {
            return (T) (typeReference.getType().equals(String.class)? str : objectMapper.readValue(str,typeReference));
        } catch (Exception e) {
            log.warn("parse string to Object error",e);
            return null;
        }
    }

    public static <T> T str2Obj(String str,Class<?> collectionClass,Class<?>... elementClasses){
        JavaType javaType = objectMapper.getTypeFactory().constructParametricType(collectionClass,elementClasses);
        try {
            return objectMapper.readValue(str,javaType);
        } catch (Exception e) {
            log.warn("parse string to Object error",e);
            return null;
        }
    }


}
